Question about 2003 Buick Rendezvous

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I have an 03 Buick Rendevouzwith the 3.4 liter motor. The car began to miss and when I had it checked out, they determined that I had no compression in one of the cylinders. The mechanic is not sure what could have broken. Any advice?

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Have a look at the velves one may have burnt out or (bent) from over reving it! or it could be the head gasket poped,,what ever it is its likely to need the head off to fix it

Posted on Aug 28, 2010


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Your engine needs basically four things in order to start:

> Volumetric efficiency (V)
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> Compression (C)
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When there is no POWER (engine will not start), it is because one (or more) parts of the equation is missing. PRELIMINARY diagnosis is to determine which parts of the equation are present and which are missing. Then PINPOINT diagnosis is to determine WHY the missing parts are missing.

Until preliminary and pinpoint diagnosis is completed, nobody can do much more than GUESS what could be causing your problem.

With that said, you need to find out whether it is fuel or spark, or BOTH at the same time. The actual location of the problem can be narrowed down considerably by knowing this.

EXAMPLE: If there is fuel PRESSURE (verified by using a fuel pressure gauge) but there is no injector pulse or spark at the spark plugs, the cause would most likely be a cranshaft position sensor problem, because this will affect BOTH. This scenario would also completely rule out a fuel pump malfunction. However, if there is fuel pressure and injector pulse, but no spark, the problem would be more likely caused by an ignition control module, because this has nothing to do with your injectors or your fuel pump.

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For 1999 Buick Regal 3.8 liter V-6 VIN "K" check this diagram...


Hope this helps (remembe to rate and comment this answer).

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